Collaborative design? if that's the case I may have to throw together a couple of ideas i've had on the subject as I want a triple extruder at some point as well.

First of all, I like the idea of having the 3 nozzles in a row like your copper renders rather than a triangle, as trying to get the offsets set correctly for the triangle would be a nightmare, (unless you have a near perfect mounting system).
Second, I've been racking my brain on how to do this but: it should allow each nozzle to be independently leveled (for many reasons such as different temps causing some nozzles to grow closer to the bed, uneven tightness etc)

Just something to think about, if you can find an elegant solution I would love to see it. I will still be working on this in my head in my free time, may have a concept design at some point.

If you need some help, or don't understand what I just said, feel free to send me a PM anytime

Cool ideas, on different levels the only thing that comes to mind is the Ultimaker & the Spring thats in the hotend...
as far as I know its not in there for levelling, but it could maybe be made to work with a screw adjustment.

Ooh! a new idea, just spit balling here but how about a cnc'ed x carriage that has 3 (though could work with 2) rails in it and having 3 identical and low profile extruders that slide into the rails (possibly slide in from the bottom and have a screw adjustment at the top).

Think I could make that work, though dont think explained it well.

If you need some help, or don't understand what I just said, feel free to send me a PM anytime

Yeah, a dovetailed rail. That could work. Oh and so as to not waste any z axis build volume I would make the nozzles only about a centimeter below the bottom of the x carriage (seen some people make it hang down a couple inches below the x carriage but what I don't think they realize is that they are sacrificing all that space to max z height)

these nozzles being that high would mean the x carriage would be in the way of airflow front to back, but you could set up a blower style fan to blow through the 3 cold ends from x- to the x+ direction

EDIT Or to keep with a trilobite aesthetic you could have a blower fan on top blower air straight down through fins that would need to be vertical

Edited 1 time(s). Last edit at 09/12/2016 09:28PM by DaGameFace.If you need some help, or don't understand what I just said, feel free to send me a PM anytime

my extruder is well below the rails but it needed to be because of my motor, but thats only because I dont have the metal parts I need, when i have all the parts I need my bed will be lower, Z will be higher and, x motor moved, I will gain an extra 250mm in Z, though on my other printers i have 300mm of Z from the get go, and only have to swap rods & lead to go higher.